/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/AbilitySystemComponent.h
Allows GameCode to add loose gameplaytags which are not backed by a GameplayEffect. Tags added this way are not replicated! Use the 'Replicated' versions of these functions if replication is needed. It is up to the calling GameCode to make sure these tags are added on clients/server where necessary
void AddLooseGameplayTag ( const [FGameplayTag](API\Runtime\GameplayTags\FGameplayTag) & GameplayTag, int32 Count )